Spin-blockade spectroscopy of a two-level artificial molecule
M. Pioro-Ladriere (1, 2), M. Ciorga (1), J. Lapointe (1), P., Zawadzki (1), M. Korkusinski (1), P. Hawrylak (1), A.S. Sachrajda (1) ((1), Institute for Microstructural Sciences, National Research Council of Canada,, Ottawa, Ontario
TL;DR
This study uses spin-blockade spectroscopy on an artificial molecule to identify spin states and observe magnetic field effects on tunnel coupling, revealing insights into spin-dependent transport in nanoscale systems.
Contribution
It demonstrates a method to effectively reduce an artificial molecule to a two-level system and analyze its spin states and magnetic field effects using conductance spectroscopy.
Findings
Identified electronic spin-states of the two-level molecule.
Observed magnetic field-induced variations in tunnel coupling.
Showed lateral device geometry influences tunnel coupling behavior.
Abstract
Coulomb and spin blockade spectroscopy investigations have been performed on an electrostatically defined ``artificial molecule'' connected to spin polarized leads. The molecule is first effectively reduced to a two-level system by placing both constituent atoms at a specific location of the level spectrum. The spin sensitivity of the conductance enables us to identify the electronic spin-states of the two-level molecule. We find in addition that the magnetic field induces variations in the tunnel coupling between the two atoms. The lateral nature of the device is evoked to explain this behavior.
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